A certain radioactive nucleus undergoes exponential decay with a half-life of 10 days. The fraction of the initial sample that remains after 2 half lives?

When the ph is above a molecule's pka, more of the molecule will be protonated than deprotonated?

How does the law of conservation of mass apply this reaction mg + HCl - - H2 + mgcl2 A: equation needs to be balanced or if you were hydrogen atoms in the equation than magnesium or chlorine B: the law of conservation of mass has already been

Ira is working in a lab with a unknown solution. when he inserts the electrical conductivity tester in the in known, the bulb begins to glow brightly. which of these would best describe the unknown liquid?

What happens to the temperature of the object?

Opening a container of compressed gas will allow the gas molecules to escape into the air and cause the container to cool as a result. Why does this cause the container to lose heat energy and feel cooler?

What type of reaction is sodium reacting with chlorine

1. If temperature is increased, the number of collisions per second

1. Tonic Bonds are a. Formed when a metal and nonmetal transfer electrons b. Formed when a nonmetal and nonmetal share electrons Formed when a metal forms || bonds with other like atoms d. Formed when noble gases lose electrons

Why does the sun appear to be the brightest star in the sky? A - Its apparent brightness is much greater than other stars. B - It burns more gas, making it brighter than any other star.

What effect does nuclear radiation have on atoms? It splits atoms. It burns atoms. It ionizes atoms.